| // Copyright (C) 2015 Ericsson |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.ericsson.gerrit.plugins.highavailability.forwarder.rest; |
| |
| import static javax.servlet.http.HttpServletResponse.SC_BAD_REQUEST; |
| import static javax.servlet.http.HttpServletResponse.SC_NO_CONTENT; |
| |
| import com.ericsson.gerrit.plugins.highavailability.cache.Constants; |
| import com.ericsson.gerrit.plugins.highavailability.forwarder.Context; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Splitter; |
| import com.google.common.cache.Cache; |
| import com.google.gerrit.extensions.registration.DynamicMap; |
| import com.google.inject.Inject; |
| import com.google.inject.Singleton; |
| import java.io.IOException; |
| import java.util.List; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServlet; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| @Singleton |
| class CacheRestApiServlet extends HttpServlet { |
| private static final int CACHENAME_INDEX = 1; |
| private static final long serialVersionUID = -1L; |
| private static final Logger logger = LoggerFactory.getLogger(CacheRestApiServlet.class); |
| |
| private final DynamicMap<Cache<?, ?>> cacheMap; |
| |
| @Inject |
| CacheRestApiServlet(DynamicMap<Cache<?, ?>> cacheMap) { |
| this.cacheMap = cacheMap; |
| } |
| |
| @Override |
| protected void doPost(HttpServletRequest req, HttpServletResponse rsp) |
| throws IOException, ServletException { |
| rsp.setContentType("text/plain"); |
| rsp.setCharacterEncoding("UTF-8"); |
| try { |
| List<String> params = Splitter.on('/').splitToList(req.getPathInfo()); |
| String cacheName = params.get(CACHENAME_INDEX); |
| String json = req.getReader().readLine(); |
| Object key = GsonParser.fromJson(cacheName, json); |
| CacheParameters cacheKey = getCacheParameters(cacheName); |
| Cache<?, ?> cache = cacheMap.get(cacheKey.pluginName, cacheKey.cacheName); |
| if (cache == null) { |
| String msg = String.format("cache %s not found", cacheName); |
| logger.error("Failed to process eviction request: {}", msg); |
| sendError(rsp, SC_BAD_REQUEST, msg); |
| } else { |
| Context.setForwardedEvent(true); |
| evictCache(cache, cacheKey.cacheName, key); |
| rsp.setStatus(SC_NO_CONTENT); |
| } |
| } catch (IOException e) { |
| logger.error("Failed to process eviction request: {}", e.getMessage(), e); |
| sendError(rsp, SC_BAD_REQUEST, e.getMessage()); |
| } finally { |
| Context.unsetForwardedEvent(); |
| } |
| } |
| |
| @VisibleForTesting |
| public static class CacheParameters { |
| public final String pluginName; |
| public final String cacheName; |
| |
| public CacheParameters(String pluginName, String cacheName) { |
| this.pluginName = pluginName; |
| this.cacheName = cacheName; |
| } |
| } |
| |
| @VisibleForTesting |
| public static CacheParameters getCacheParameters(String cache) { |
| int dot = cache.indexOf("."); |
| if (dot > 0) { |
| return new CacheParameters(cache.substring(0, dot), cache.substring(dot + 1)); |
| } |
| return new CacheParameters(Constants.GERRIT, cache); |
| } |
| |
| private static void sendError(HttpServletResponse rsp, int statusCode, String message) { |
| try { |
| rsp.sendError(statusCode, message); |
| } catch (IOException e) { |
| logger.error("Failed to send error messsage: {}", e.getMessage(), e); |
| } |
| } |
| |
| private void evictCache(Cache<?, ?> cache, String cacheName, Object key) { |
| if (Constants.PROJECT_LIST.equals(cacheName)) { |
| // One key is holding the list of projects |
| cache.invalidateAll(); |
| logger.debug("Invalidated cache {}", cacheName); |
| } else { |
| cache.invalidate(key); |
| logger.debug("Invalidated cache {}[{}]", cacheName, key); |
| } |
| } |
| } |